TWI529084B - Railway vehicle frame - Google Patents

Description

Railway vehicle frame

The present invention relates to a frame of a railway vehicle.

In a railway vehicle, a main motor and a gear device are mounted on the frame, and the power of the main motor is transmitted to the axle through the gear device, and then travels on the rail.

Figure 1 is a top view showing a conventional frame. Fig. 2 is a plan view showing, in an enlarged manner, a portion of a cross member of a conventional frame. As shown in Fig. 1, the frame 101 includes a pair of side members 102 that are disposed on the right and left sides in the track direction, and a beam 103 that connects the side members 102. The beam 103 is composed of a cylindrical steel pipe, and both ends thereof are joined to the side members 102 by welding.

On the outer peripheral surface of the beam 103, a socket for mounting a main motor (hereinafter referred to as a "main motor socket") 104 is joined by welding, and a socket for mounting the gear device is joined by welding (hereinafter, It is called "the seat for gears") 105 (for example, refer to Patent Documents 1 and 2).

Here, the main motor socket 104 and the gear device bearing The seat 105 and the beam 103 are originally completely separate individual components. The main motor socket 104 has a rib structure in a large amount because of the reaction force of the main motor and the high load of the weight of the main motor itself during running of the railway vehicle. The gear holder socket 105 is also the same. For this reason, in the conventional frame 101, since the respective sockets 104, 105 of the rib structure are welded to the cylindrical beam 103, the short welded portion of the weld line is increased. In the welded portion, the welding quality tends to decrease at the starting point and the end portion of the welding, and in the case of a short welding line, the above tendency tends to occur more easily.

Further, in the welded portion between the respective seats 104, 105 and the beam 103, it is easy to cause stress concentration due to the high load applied to each of the sockets 104, 105 while the railway vehicle is traveling. In particular, as shown in Fig. 2, the end portion (skirt) portion of the upper surface portion and the lower surface portion of each of the sockets 104, 105 joined to the beam 103 (the portion surrounded by a thick circle in Fig. 2) There is a toe of a fillet weld called an "angular leading edge", and stress is concentrated on the angular leading edge. Therefore, the angular leading edge must be ground to smooth with a grinder.

Because the frame is the majority of the construction during the assembly, it requires excellent welding workability. However, in the conventional frame 101, as described above, when the main motor socket 104 and the gear device socket 105 are welded and joined to the beam 103, in addition to the weld portion having a short weld line, The angular leading edge must be ground, so that it is easy to highlight the poor quality of the welded portion and the efficiency of the welding construction is not good. Accordingly, the conventional frame 101 has poor weldability during assembly.

[Patent Document 1] Japanese Patent No. 4292980

[Patent Document 2] Japanese Patent No. 3873659

The present invention has been made in view of the above problems, and an object thereof is to provide a frame for a railway vehicle which can achieve excellent welding workability at the time of assembly.

In order to achieve the above-mentioned object, the inventors of the present invention have "when the bearing for the main motor and the bearing for the gear unit are welded to the cross member, the quality of the welded portion can be ensured, and the efficiency of the welding construction can be improved". The technology of "reducing the welded portion with a short weld line and reducing the angular leading edge to be ground" is repeatedly studied. As a result, the following findings are effective: the cross member forms a structure in which four panel joints are formed, and the top plate member and the bottom plate member among the respective plate members constituting the four faces are integrally formed with the above-described members. And a bearing support portion of the upper surface portion and the lower surface portion of the socket for the gear device, and the socket is welded and joined to the socket support portion.

The present invention is an invention based on the above findings, which is intended to be the frame of a railway vehicle described below. That is, it is provided with "a pair of left and right side beams arranged along the track direction" and "a beam connecting the side beams" The frame of the railway vehicle is characterized in that the cross member is composed of: a top plate member; a bottom plate member; and a pair of front and rear side plate members disposed between the top plate member and the bottom plate member and welded and joined, corresponding to The positions of the sockets for mounting the main motor and the gear unit are respectively arranged to extend from the front and rear edges of the top plate member and the bottom plate member, and the socket is welded and joined to the socket support portion.

Further, in the above-described frame, the contour shape of the front and rear edges of the top plate member and the bottom plate member from the left and right edges of the socket support portion is preferably formed in a folded skirt shape at three or more locations.

In the above frame, the side sill is composed of a roof member for a side sill, a floor member for a side sill, and a floor member for the side sill and a floor member for a side sill, and is welded and joined. The pair of left and right side member members for the side members extend from the left and right edges of the side member for the side member and the bottom member for the side member to the position where the cross member is disposed, and preferably the left and right end portions of the cross member are sandwiched The joining portions are welded to each other.

According to the frame of the railway vehicle of the present invention, when the main motor socket and the gear device are welded and joined to the cross member, the welded portion having a short weld line can be reduced, and the angular leading edge to be ground can be reduced. As a result, the quality of the welded portion can be ensured, and the efficiency of the welding construction can be improved, and excellent welding workability can be achieved at the time of assembly.

1‧‧‧ frame

2‧‧‧Side beam

3‧‧‧ beams

4‧‧‧Main motor socket

5‧‧‧Recumbent for gear units

6‧‧‧Spring cap components

21‧‧‧Top member for side sill

22‧‧‧Slabs for side beams

23‧‧‧Side plate members for side beams

24‧‧‧Connecting Department

31‧‧‧Top member for beam

31a‧‧‧Front and front edges of the roof member for beams

32‧‧‧Baffle plate members

32a‧‧‧ front and rear edges of the floor member for beams

33‧‧‧Side plate members for beams

34‧‧‧Main motor bearing support

34a‧‧‧Left and right edges of the bearing support for the main motor

35‧‧‧Seat support for gear units

35a‧‧‧left and right edges of the bearing support for gear units

Wg‧‧‧welding bead

Figure 1: A top view showing the traditional frame.

Fig. 2 is a plan view showing an enlarged view of a portion of a seat on a beam of a conventional frame.

Fig. 3 is a perspective view showing an example of the frame of the present invention, wherein Fig. 3(a) shows a state seen from obliquely above, and Fig. 3(b) shows a state seen from obliquely below.

Fig. 4 is a plan view of the frame shown in Fig. 3.

Fig. 5 is a cross-sectional view showing an example of a method for improving the safety rate of the seat support portion of the cross member of the frame of the present invention, in which the seat support portion is enlarged.

Fig. 6 is a cross-sectional view showing a portion of the seat supporting portion of the cross member of the frame of the present invention for improving the safety rate, showing a portion in which the socket supporting portion is enlarged.

Hereinafter, an embodiment of the frame of the railway vehicle of the present invention will be described in detail.

Fig. 3 is a perspective view showing an example of the frame of the present invention, wherein Fig. 3(a) shows a state seen from obliquely above, and Fig. 3(b) shows a state seen from obliquely below. Fig. 4 is a plan view of the frame shown in Fig. 3. In Figure 4 is shown: in the beam with The part where the side sills are connected is partially cut open. As shown in FIGS. 3 and 4, the frame 1 includes a pair of right and left side sills 2 disposed along the track direction, and a cross member 3 that connects the side sills 2. In the frame 1 of the present invention, the beam 3 has a structure in which four panels are joined, and the side members 2 are also in a structure in which four panels are joined.

Specifically, the beam 3 is composed of a top plate member (hereinafter referred to as "beam top member") 31 and a bottom plate member (hereinafter referred to as "beam bottom plate member") 32; and a pair of front and rear side plates A member (hereinafter referred to as a "side member for a beam") 33 is formed. The above-described plate members 31 to 33 are members that are press-formed on a steel sheet and subjected to bending processing as needed. The beam side plate member 33 is disposed between the beam top plate member 31 and the beam bottom plate member 32, and the upper edge of the beam side plate member 33 is buttted to the lower surface of the beam top plate member 31 to form a welded joint, and the beam The lower edge of the side plate member 33 is butted against the upper surface of the cross member 32 for the beam to form a welded joint, and thus the beam 3 is assembled. The main motor socket 4 and the gear device holder 5 having the rib structure are joined to the beam 3 by welding.

The pair of right and left side sills 2 are composed of a side sill top member 21, a side sill bottom member 22, and a pair of left and right side sill side members 23, respectively. The above-described plate members 21 to 23 are also members which are press-formed on a steel sheet and subjected to bending processing as needed. The side member for side sill 23 is disposed between the side member for side sill 21 and the side member for side sill 22, and the upper edge of the side sill member 23 is butted against the lower surface of the side sill member 21 to form a welded joint. And the lower side of the side member 23 for the side member The rim is butted against the upper surface of the side member 22 for side sills and forms a welded joint, so that the side sill 2 is assembled.

At each of the front and rear ends of the side sill 2, a spring cap member 6 is welded and joined. The spring cap member 6 is for mounting: an axle box that is not shown in the drawing and that supports the axle to be freely rotatable.

The beam 3 is joined to the side member 2 by welding the side members 2 at the left and right ends thereof. The portion where the beam 3 and the side member 2 are connected is configured as described below. The side members 2 extend from the left and right edges of the side member for the side member 21 and the side member 22 for the side members to the connection portion 24 in accordance with the position at which the beam 3 is disposed. These connecting portions 24 are integrally formed in advance with the respective side member for roof beams 21 and the side member 22 for side members. In the cross member 3, the cross member for the beam member 31 and the bottom plate member 32 for the beam are formed shorter than the side plate member 33 for the beam, and the left and right end portions of the side plate member 33 for the beam are formed from the top plate member 31 for the beam and the bottom plate member for the beam. 32 prominent states.

Then, the end portions of the side member members 33 for the beam are joined to the side member 23 for the side members in a state in which they are sandwiched between the connection portions 24 of the side members 2, respectively, and welded, and respectively The upper edge is butted against the lower surface of the beam top member 31, and the lower edge thereof is butted against the upper surface of the beam bottom member 32 to form a welded joint. Further, the end edges of the beam top member 31 and the beam bottom member 32 abut against the end edges of the connecting portions 24 of the side members 2 on the same surface to form a welded joint. In this way, the state in which the beam 3 is connected to the side member 2 is formed.

As described above, the beam 3 and the side sill 2 are connected by the connecting portion 24 extending from the side sill 2, and the position of the welding joint between the beam 3 and the lower surface of the side sill 2 is placed on the beam 3, so that With the high stress "the load acting on the frame 1", it is safe to be burdened by both ends of the beam 3 whose strength is stable.

Further, in the frame 1 of the present invention, the main motor socket 4 and the gear device socket 5 are welded and joined to the beam 3, except that the "beam 3 is formed by four panel joints". Therefore, the configuration is as follows. The top member for the beam member 31 and the bottom plate member 32 for the beam extend from the front and rear edges of the frame support portion (hereinafter referred to as "main motor seat support portion" in accordance with the position at which the main motor socket 4 is disposed. ) 34. These socket support portions 34 correspond to the upper surface portion and the lower surface portion of the main motor socket 4, and are integrally formed in advance with the respective beam top plate members 31 and the beam bottom plate members 32.

In addition, the top plate member 31 for the beam and the bottom plate member 32 for the beam extend from the front and rear edges of the support member at positions corresponding to the position of the gear device holder 5 (hereinafter referred to as "bearing support for the gear unit" Department") 35. These socket support portions 35 correspond to the upper surface portion and the lower surface portion of the gear device holder 5, and are integrally formed in advance with the respective beam top plate members 31 and the beam bottom plate members 32. The main motor socket 4 and the gear device socket 5 of the rib structure are further joined to the bracket side plate members 33 by welding to the socket support portions 34 and 35.

In this way, the beam top member 31 and the beam bottom member 32, that is, the beam 3 are integrally formed to form the equivalent The socket support portions 34, 35 on the upper surface of the seats 4, 5 and the lower portion are welded to the above-described socket support portions 34, 35 by the sockets 4, 5, as in the case of the conventional frame 101. The angular leading edge of the welded portion between the seats 104, 105 and the beam 103 (refer to the second drawing described above) becomes non-existent, so that the step of polishing trimming can be reduced. Moreover, since the rib-structured sockets 4, 5 are welded and joined to the four-sided beam 3, instead of the beam 103 formed of a steel pipe like the conventional frame 101, the welded portion having a short welding line is reduced.

Accordingly, in the frame 1 of the present invention, when the respective brackets 4, 5 are welded and joined to the beam 3, the welded portion having a short weld line can be reduced, and the angular leading edge to be ground can be reduced. As a result, the quality of the welded portion can be ensured, and the efficiency of the welding construction can be improved, and excellent welding workability at the time of assembly can be achieved.

Here, since each of the sockets 4 and 5 is subjected to a high load during running of the railway vehicle, stress concentration is likely to occur at the root of the socket supporting portions 34 and 35 extending from the beam top member 31 and the beam bottom member 32. . In particular, stress concentration is formed in the corner portions where the left and right edges of the seat supporting portions 34 and 35 and the front and rear edges of the beam top member 31 and the beam bottom member 32 are formed to intersect each other. Then, the bead for joining the "cross member member 31 and the beam bottom member 32 and the beam side member 33" is superimposed on or near the "corner portion where stress is concentrated", and the corner portion is made The stress endurance limit is low, so there is a fear that the safety rate will drop. Therefore, it is preferable to carry out a process of improving the safety rate at the socket support portions 34, 35. Listed below The way (method) of this processing.

Fig. 5 is a cross-sectional view showing an example of a method for improving the safety rate of the seat supporting portion on the cross member of the frame of the present invention, in order to enlarge the portion of the bearing support portion. As shown in Fig. 5, "the front and rear edges 31a, 32a of the beam top member 31 and the beam bottom member 32" are used to "the beads for joining the plate members 31, 32 and the beam side plate member 33". The distance from the boundary of the Wg is set to L, and the front and rear edge portions of the beam top member 31 and the beam bottom member 32 protrude from the boundary of the bead Wg.

In this case, the longer the distance L, the corner portion where the stress is concentrated means "the left and right edges 34a, 35a of the socket supporting portions 34, 35; and the front and rear members of the beam and the bottom plate member 32 for the beam. The corner portion where the edges 31a, 32a form an intersection" will be away from the bead, and with this phenomenon, since the fatigue limit stress of the corner portion approaches the nominal stress, the support at the socket support portions 34, 35 can be improved. Security rate. As long as the configuration relationship between the various parts constituting the trolley (railway vehicle) allows, the distance L is as long as possible. The corner portion described above is subjected to round chamfering.

Fig. 6 is a cross-sectional view showing a portion of the seat supporting portion on the cross member of the frame of the present invention, which is a method for improving the safety rate, and showing a portion of the socket supporting portion in an enlarged manner. As shown in Fig. 6, the contour shapes of the front edges 31a, 32a from the left and right edges 34a, 35a of the shoe supporting portions 34, 35 to the top plate member 31 for the beam and the bottom plate member 32 for the beam are preferably formed: The top member 31 and the edge 31a of the cross member 32 for the beam are used. From the side of 32a, the skirt is bent at three positions of the point P1, the point P2, and the point P3. The three positions that were bent were rounded.

As described above, the stress is mainly distributed in two places on the side of the edges 31a and 32a of the beam top member 31 and the beam bottom member 32 by the contour shape of the skirt which is bent at three positions. The position (point P1, point P2), along with this state, causes the fatigue limit stress at each of the above positions to approach the nominal stress, so that the safety ratio can be improved at the socket support portions 34, 35. In particular, the same effect can be achieved as long as it is bent at three or more positions.

[Examples]

In order to confirm the effect of the frame of the present invention, the following judgment was performed.

[welding workability]

In the frame of the present invention shown in Fig. 3 and the conventional frame shown in Fig. 1, the socket for the main motor and the socket for the gear unit are welded and joined to the beam, and are limited to the welded portion of the socket. Investigate the number of welded parts with short weld lines. Here, in the welded portion where the welding line is short, a welded portion having a length of 99 mm or less is picked out.

As a result of the investigation, the welded portion having a short weld line has 12 frames with respect to the conventional frame, and the number of the frame of the present invention is significantly reduced. According to this result, it is clear that the frame of the present invention can reduce the welded portion having a short weld line when the joints are welded and joined to the cross member, and can secure The quality of the welded part.

[About the stress safety rate of the seat]

In the frame of the present invention shown in FIG. 3, the stress safety rate of the seat support portion which is extended from the cross member of the four-panel structure and corresponds to the upper surface of the main motor seat is investigated. . In addition, in order to perform the comparison, the stress safety rate of the "surface of the upper surface of the main motor seat for welding the beam of the steel pipe" was investigated for the conventional frame shown in Fig. 1 . In terms of conditions, the static load test of "the load on the main load of the main load of the load" is performed. When the test is performed, the frame of the present invention measures the stress acting on the support portion of the seat, and the conventional frame measures the load. The stress acting on the face above the seat, and the safety rate is calculated based on the stress. The fatigue limit of the welded portion is based on the method based on JIS-E-4207.

As a result of the investigation, the frame rate of the present invention was increased to 1.9 compared to the conventional frame. From this result, it is clear that the frame of the present invention can increase the stress safety rate associated with the seat.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and scope of the invention. For example, when the cross member and the side member of the "four panel joining structure" are individually joined, in the above-described embodiment, the end edge of the cross member for the cross member and the bottom member for the cross member are displayed on the same side. The upper end of the connecting portion of the side member is butt welded to the side edge of the side member of the cross member, and the end edge portion of the cross member for the cross member can be overlapped with the side member directly or via an anvil. Below the end edge of the connecting portion, in the above The components are subjected to a fillet weld. In addition, in order to individually ensure the rigidity of the beam and the side sill of the "four panel joining structure", the reinforcing plate may be welded and joined to the inside of the beam and the side sill.

[Industrial availability]

The frame of the railway vehicle of the present invention can be applied to all railway vehicles.

1‧‧‧ frame

2‧‧‧Side beam

3‧‧‧ beams

4‧‧‧Main motor socket

5‧‧‧Recumbent for gear units

6‧‧‧Spring cap components

21‧‧‧Top member for side sill

22‧‧‧Slabs for side beams

23‧‧‧Side plate members for side beams

24‧‧‧Connecting Department

31‧‧‧Top member for beam

32‧‧‧Baffle plate members

33‧‧‧Side plate members for beams

34‧‧‧Main motor bearing support

35‧‧‧Seat support for gear units

Claims (6)

A frame of a railway vehicle includes a pair of right and left side beams disposed along a track direction and a cross member connecting the side beams, and the pair of side beams is a frame of a railway vehicle connected by only one beam, and is characterized by The cross member is composed of: a top plate member; a bottom plate member; and a pair of front and rear side plate members disposed between the top plate member and the bottom plate member and welded and joined; corresponding to respectively for mounting the main motor and the gear device The position of the socket is extended from the front and rear edges of the top plate member and the bottom plate member to the socket support portion, and the socket is welded and joined to the socket support portion. A frame of a railway vehicle is a frame of a railway vehicle including a pair of right and left side beams arranged in a track direction and a beam connecting the side beams, wherein the beam is composed of a top plate member and a bottom plate. a member; and a pair of front and rear side plate members disposed between the top plate member and the bottom plate member and welded and joined; corresponding to positions of the seats respectively for mounting the first main motor and the first gear device, from the top plate The front edge of the member and the bottom plate member extends out of the socket support portion, corresponding to the position of the seat for mounting the second main motor and the second gear device, respectively, extending from the rear edge of the top plate member and the bottom plate member The support portion and the socket are respectively welded and joined to the socket support portion. A frame of a railway vehicle is a vehicle having a pair of left and right side beams arranged along the track direction and a railway vehicle connecting the beams of the side beams The frame is characterized in that: the beam is composed of: a top plate member; a bottom plate member; and a pair of front and rear side plate members disposed between the top plate member and the bottom plate member and welded and joined; corresponding to respectively for mounting the main motor And a position where the bearing of the gear device is disposed, the socket support portion is extended from the front and rear edges of the top plate member and the bottom plate member, and the socket is welded and joined to the socket support portion and the side plate member. The frame of the railway vehicle according to any one of claims 1 to 3, wherein the contour shape of the front edge from the left and right edges of the socket support portion to the top plate member and the floor member is three. The above part forms a bent skirt. The frame of the railway vehicle according to any one of claims 1 to 3, wherein the side sill is configured as follows: a side member for a side sill; a bottom member for a side sill; and a side sill disposed on the side sill a pair of right and left side plate members for the side members which are welded and joined between the top plate member and the side member for the side members; and the left and right edges of the side member for the side members and the side members for the side members are arranged corresponding to the positions at which the beams are disposed The connecting portion is provided, and the left and right end portions of the cross member are sandwiched between the connecting portions and welded to each other. The frame of the railway vehicle according to the fourth aspect of the invention, wherein the side sill is configured as follows: a side member for a side sill; a bottom member for a side sill; and a top member and a side member for the side sill a pair of left and right side plate members for side beams that are welded and joined between the floor members for the beam; a top plate member for the side members and a bottom member for the side members corresponding to the position where the beams are disposed The left and right edges of the plate member extend out of the connecting portion, and the left and right end portions of the beam are sandwiched between the connecting portions and welded to each other.